flatness tolerances on hydraulic pumps are really low, down in the micron range. If you can't get those pins out you're going to do more harm than good trying to lap it. run a finger across and carefully buff off any burrs that would keep the sections from seating properly. The end clearance on a gear pump is the largest driver of pump efficiency as well as durability. There is a a fine line between too much clearance and too much fluid slip across the gear faces reducing efficiency and possibly even pressure capability of the pump. Too little clearance and you can run into scuffing issues that will stick a pump or completely destroy it. Debris sensitivity comes into play here too.
I've seen gear pumps with the faces of the gear teeth worn so bad they were concave instead of convex and the lash was terrible but the end clearance hadn't worn at all and the pump still worked fine. No indication from the operator anything was wrong, pump came back to me for 20,000 tear-down inspection.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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